Road Salt Tolerance

I'm looking for a list of perennials that are tolerant of roadside 
conditions, including automobile pollution and road salt.  It is easy to find 
lists of salt-tolerant woody plants, but my web search didn't turn up 
anything on perennials. I realize they are not above ground in the winter, 
but still some of them are going to be sensitive to the build up of salts 
from snow removal.  If you have experience or references to share, I will 
appreciate it.  :Janis

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